/
lib.go
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/
lib.go
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/*
Copyright AppsCode Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package verifier
import (
"crypto/x509"
"encoding/pem"
"fmt"
"strings"
"unicode"
"go.bytebuilders.dev/license-verifier/apis/licenses/v1alpha1"
"github.com/pkg/errors"
"gomodules.xyz/sets"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type Options struct {
ClusterUID string `json:"clusterUID"`
Features string `json:"features"`
CACert []byte `json:"caCert,omitempty"`
License []byte `json:"license"`
}
func VerifyLicense(opts *Options) (v1alpha1.License, error) {
if opts == nil {
return BadLicense(fmt.Errorf("missing license"))
}
cert, err := parseCertificate(opts.License)
if err != nil {
return BadLicense(err)
}
// First, create the set of root certificates. For this example we only
// have one. It's also possible to omit this in order to use the
// default root set of the current operating system.
roots := x509.NewCertPool()
ok := roots.AppendCertsFromPEM(opts.CACert)
if !ok {
return BadLicense(errors.New("failed to parse root certificate"))
}
crtopts := x509.VerifyOptions{
DNSName: opts.ClusterUID,
Roots: roots,
KeyUsages: []x509.ExtKeyUsage{
x509.ExtKeyUsageClientAuth,
},
}
// wildcard certificate
if strings.HasPrefix(cert.Subject.CommonName, "*.") {
caCert, err := parseCertificate(opts.CACert)
if err != nil {
return BadLicense(err)
}
if len(caCert.Subject.Organization) > 0 {
crtopts.DNSName = "*." + caCert.Subject.Organization[0]
}
}
license := v1alpha1.License{
TypeMeta: metav1.TypeMeta{
APIVersion: v1alpha1.SchemeGroupVersion.String(),
Kind: "License",
},
Issuer: "byte.builders",
Clusters: cert.DNSNames,
NotBefore: &metav1.Time{Time: cert.NotBefore},
NotAfter: &metav1.Time{Time: cert.NotAfter},
ID: cert.SerialNumber.String(),
Features: cert.Subject.Organization,
}
if len(cert.Subject.OrganizationalUnit) > 0 {
license.PlanName = cert.Subject.OrganizationalUnit[0]
} else {
// old certificate, so plan name auto detected from feature
// ref: https://github.com/appscode/offline-license-server/blob/v0.0.20/pkg/server/constants.go#L50-L59
features := sets.NewString(cert.Subject.Organization...)
if features.Has("kubedb-enterprise") {
license.PlanName = "kubedb-enterprise"
} else if features.Has("kubedb-community") {
license.PlanName = "kubedb-community"
} else if features.Has("stash-enterprise") {
license.PlanName = "stash-enterprise"
} else if features.Has("stash-community") {
license.PlanName = "stash-community"
}
}
var user *v1alpha1.User
for _, e := range cert.EmailAddresses {
parts := strings.FieldsFunc(e, func(r rune) bool {
return r == '<' || r == '>'
})
if len(parts) == 0 {
continue
}
if len(parts) == 1 {
email := strings.TrimSpace(parts[0])
if user == nil {
user = &v1alpha1.User{
Name: "",
Email: email,
}
} else if user.Email != email {
return BadLicense(fmt.Errorf("license issued to multiple emails %s", strings.Join(cert.EmailAddresses, ";")))
}
} else { // == 2
email := strings.TrimSpace(parts[1])
if user == nil {
user = &v1alpha1.User{
Name: strings.TrimSpace(parts[0]),
Email: email,
}
} else if user.Email != email {
return BadLicense(fmt.Errorf("license issued to multiple emails %s", strings.Join(cert.EmailAddresses, ";")))
}
}
}
license.User = user
// ref: https://github.com/appscode/gitea/blob/master/models/stripe_license.go#L117-L126
if _, err := cert.Verify(crtopts); err != nil {
e2 := errors.Wrap(err, "failed to verify certificate")
license.Status = v1alpha1.LicenseExpired
license.Reason = e2.Error()
return license, e2
}
features := strings.FieldsFunc(opts.Features, func(r rune) bool {
return unicode.IsSpace(r) || r == ',' || r == ';'
})
if !sets.NewString(cert.Subject.Organization...).HasAny(features...) {
e2 := fmt.Errorf("license was not issued for %s", opts.Features)
license.Status = v1alpha1.LicenseExpired
license.Reason = e2.Error()
return license, e2
}
license.Status = v1alpha1.LicenseActive
return license, nil
}
func parseCertificate(data []byte) (*x509.Certificate, error) {
block, _ := pem.Decode(data)
if block == nil {
// This probably is a JWT token, should be check for that when ready
return nil, errors.New("failed to parse certificate PEM")
}
return x509.ParseCertificate(block.Bytes)
}
func BadLicense(err error) (v1alpha1.License, error) {
if err == nil {
// This should never happen
panic(err)
}
return v1alpha1.License{
TypeMeta: metav1.TypeMeta{
APIVersion: v1alpha1.SchemeGroupVersion.String(),
Kind: "License",
},
Status: v1alpha1.LicenseUnknown,
Reason: err.Error(),
}, err
}